package com.example.config.monitor;

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.TaskExecutor;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * @Classname ExecutorConfig
 * @Description 异步线程池配置
 * @Author Liyuhang
 * @Date 2020/12/14 下午3:04
 */
@Configuration
@EnableAsync
@Slf4j
public class ExecutorConfig {

    /**
     * 核心线程
     */
    @Value("${async.executor.thread.core_pool_size:#{8}}")
    private int corePoolSize;
    /**
     * 最大线程
     */
    @Value("${async.executor.thread.max_pool_size:#{16}}")
    private int maxPoolSize;
    /**
     * 队列长度
     */
    @Value("${async.executor.thread.queue_capacity:#{999999}}")
    private int queueCapacity;
    /**
     * 线程名前缀
     */
    @Value("${async.executor.thread.name.prefix:#{'async-service-'}}")
    private String namePrefix;

    @Bean(name = "asyncServiceExecutor")
    public TaskExecutor asyncServiceExecutor() {
        log.info("start asyncServiceExecutor");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 配置核心线程数
        executor.setCorePoolSize(corePoolSize);
        // 配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        // 配置队列大小
        executor.setQueueCapacity(queueCapacity);
        // 配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(namePrefix);
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 执行初始化
        executor.initialize();
        return executor;
    }

    @Bean(name = "executorService")
    public ExecutorService executorService(){
        ThreadFactory namedThreadFactory = new ThreadFactoryBuilder()
                .setNameFormat("restor-%d").build();
        int corePoolSize=Runtime.getRuntime().availableProcessors() ;
        ThreadPoolExecutor pool = new ThreadPoolExecutor(corePoolSize * 2, 200,
                30L, TimeUnit.MILLISECONDS,
                new LinkedBlockingQueue<>(1000), namedThreadFactory, new ThreadPoolExecutor.CallerRunsPolicy());
        return pool;
    }

}